Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-93268— ext4: skip extra isize expansion during mount to prevent deadlock

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，以下漏洞已得到修复： ext4：在挂载期间跳过额外的 isize 扩展，以防止死锁 在持有活动 jbd2 句柄的情况下从 调用。在挂载阶段（未设置 SB_ACTIVE 标志时），扩展路径可能将扩展属性（xattrs）移动到外部块，并通过 释放 ea_inodes 节点。当未设置 SB_ACTIVE 标志时， 会调用 ，后者会获取 锁，从而形成循环锁依赖： 该问题可通过以下调用路径触发： 1. → → → 或 2. → → 修复方案：在未设置 SB_ACTIVE 标志（即非活跃状态）时跳过扩展

AI Predicted 5.5 Difficulty: Trivial EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux c8585c6fcaf2011de54c3592e80a634a2b9e1a7f< 41897f1bcf4ace5f1f28d0be784b6f4f0e929641 affected
c8585c6fcaf2011de54c3592e80a634a2b9e1a7f< 9c3469377b1d8caba6bec6ef3c460810bbfb02cc affected
c8585c6fcaf2011de54c3592e80a634a2b9e1a7f< 1dd4882dbdc8bfdf2182fa388883c143fac0902a affected
c8585c6fcaf2011de54c3592e80a634a2b9e1a7f< 7ba09330d9ea6e996228316719eae812d7e04983 affected
c8585c6fcaf2011de54c3592e80a634a2b9e1a7f< c5e6434cc55f30220b228be237bb666351f9f4dd affected
c8585c6fcaf2011de54c3592e80a634a2b9e1a7f< 7ace189b9ea79cf78df9c32b940ce12735f9459a affected
c8585c6fcaf2011de54c3592e80a634a2b9e1a7f< 2fb8ff81659a57c42bb7b49e8339a2be2a318ef8 affected
c8585c6fcaf2011de54c3592e80a634a2b9e1a7f< 7461c60b9c6a839b13ad4c3490681a0cf5aa0637 affected
… +10 more rows
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-93268

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
ext4: skip extra isize expansion during mount to prevent deadlock
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ext4: skip extra isize expansion during mount to prevent deadlock ext4_try_to_expand_extra_isize() is called from __ext4_mark_inode_dirty() while holding an active jbd2 handle. During mount (!SB_ACTIVE), the expand path may move xattrs to external blocks and release ea_inodes via iput(). When !SB_ACTIVE, iput() calls write_inode_now() which acquires s_writepages_rwsem, creating a circular lock dependency: s_writepages_rwsem --> jbd2_handle --> xattr_sem --> s_writepages_rwsem This can be triggered via: ext4_process_orphan() -> ext4_truncate() -> ext4_mark_inode_dirty() -> ext4_try_to_expand_extra_isize() or: ext4_evict_inode() -> ext4_mark_inode_dirty() -> ext4_try_to_expand_extra_isize() Skip expansion when !SB_ACTIVE. This is a minor loss of functionality (extra isize won't grow for these inodes during mount), which e2fsck can resolve later if needed.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux c8585c6fcaf2011de54c3592e80a634a2b9e1a7f ~ 41897f1bcf4ace5f1f28d0be784b6f4f0e929641 -
Linux Linux 4.7 -

II. Public POCs for CVE-2026-93268

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-93268

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-93268 (8)

Same Patch Batch · Linux · 2026-09-24 · 234 CVEs total

CVE-2026-93207 9.8 CRITICAL SUNRPC: Zero rpc_gss_wire_cred at svcauth_gss_decode_credbody() entry
CVE-2026-97413 9.8 CRITICAL RDMA/rtrs-srv: Fix integer underflow in process_read and process_write
CVE-2026-93228 9.1 CRITICAL svcrdma: Reject Write/Reply chunks with segcount 0
CVE-2026-93793 8.8 HIGH wifi: iwlwifi: mvm: validate TX_CMD response layout
CVE-2026-93799 8.8 HIGH wifi: iwlwifi: mvm: validate sta_id in BA window status notif
CVE-2026-93790 8.8 HIGH wifi: iwlwifi: mvm: fix out-of-bounds tid_data access in BA notif
CVE-2026-93806 8.8 HIGH wifi: cfg80211: validate assoc response length before status and IE access
CVE-2026-97442 8.8 HIGH wifi: ath11k: fix invalid data access in ath11k_dp_rx_h_undecap_nwifi
CVE-2026-97509 8.8 HIGH thunderbolt: Keep XDomain reference during the lifetime of a service
CVE-2026-97409 8.8 HIGH nvme-fc: Do not cancel requests in io target before it is initialized
CVE-2026-93280 8.8 HIGH greybus: audio: bound the topology section sizes against the fetched size
CVE-2026-93284 8.8 HIGH drm/pagemap: dma-unmap pages before handling migration errors
CVE-2026-97451 8.4 HIGH ACPICA: Fix integer overflow in acpi_ex_opcode_3A_1T_1R() (mid_op)
CVE-2026-97452 8.4 HIGH ACPICA: Prevent adding invalid references
CVE-2026-97455 8.4 HIGH ACPICA: Fix use-after-free in acpi_ds_terminate_control_method()
CVE-2026-97450 8.4 HIGH ACPICA: validate handler object type in two places
CVE-2026-93827 8.4 HIGH virtio-fs: avoid double-free on failed queue setup
CVE-2026-97433 8.2 HIGH nvme: validate FDP configuration descriptor sizes
CVE-2026-93221 8.1 HIGH nfsd: convert nfsd_net boolean flags to unsigned long flags word
CVE-2026-93786 8.1 HIGH ksmbd: preserve VFS inherited POSIX ACL mask

Showing top 20 of 234 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-93268

No comments yet

Leave a comment